:root {
    --bg-color: #0b1021;
    --text-color: #e0e6ed;
    --card-bg: rgba(255, 255, 255, 0.15);
    --card-border: rgba(255, 255, 255, 0.2);
    --card-hover: rgba(255, 255, 255, 0.25);
    --primary: #4a90e2;
    --danger: #e24a4a;
    --star-color: #fff;
    --shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    --glow: 0 0 20px rgba(74, 144, 226, 0.5);
}

.day-mode {
    --bg-color: #87CEEB; /* 天蓝色 */
    --text-color: #2c3e50;
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.5);
    --card-hover: rgba(255, 255, 255, 0.9);
    --primary: #2980b9;
    --danger: #c0392b;
    --star-color: transparent; /* 白天隐藏星星 */
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --glow: 0 0 15px rgba(255, 255, 255, 0.8);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 1s ease, color 0.5s ease;
    position: relative;
}

/* Background effects */
#background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
}

/* 星空效果 */
.stars {
    width: 1px;
    height: 1px;
    background: transparent;
    box-shadow: 
        10vw 20vh var(--star-color),
        20vw 40vh var(--star-color),
        30vw 10vh var(--star-color),
        40vw 50vh var(--star-color),
        50vw 30vh var(--star-color),
        60vw 70vh var(--star-color),
        70vw 20vh var(--star-color),
        80vw 80vh var(--star-color),
        90vw 40vh var(--star-color),
        15vw 60vh var(--star-color),
        25vw 90vh var(--star-color),
        35vw 35vh var(--star-color),
        45vw 15vh var(--star-color),
        55vw 85vh var(--star-color),
        65vw 55vh var(--star-color),
        75vw 5vh var(--star-color),
        85vw 25vh var(--star-color),
        95vw 65vh var(--star-color);
    animation: twinkle 4s infinite alternate;
    transition: box-shadow 1s ease;
}
.stars::after {
    content: " ";
    position: absolute;
    top: 2000px;
    width: 1px;
    height: 1px;
    background: transparent;
    box-shadow: inherit;
}

@keyframes twinkle {
    0% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.5); }
}

/* 白天云朵效果 */
.clouds {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    opacity: 0;
    transition: opacity 1s ease;
    pointer-events: none;
}
.day-mode .clouds {
    opacity: 0.5;
    background: 
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.8) 0%, transparent 20%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.6) 0%, transparent 25%),
        radial-gradient(circle at 50% 10%, rgba(255,255,255,0.7) 0%, transparent 30%);
    animation: drift 60s infinite linear;
}

@keyframes drift {
    from { transform: translateX(-5%); }
    to { transform: translateX(5%); }
}

/* 动态炫彩光球 */
.glowing-orbs {
    position: absolute;
    width: 100vw;
    height: 100vh;
    top: 0;
    left: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: floatOrb 20s infinite ease-in-out alternate;
}

.orb-1 {
    width: 30vw;
    height: 30vw;
    background: #4a90e2;
    top: -10%;
    left: -10%;
    animation-duration: 25s;
}

.orb-2 {
    width: 40vw;
    height: 40vw;
    background: #9b59b6;
    bottom: -20%;
    right: -10%;
    animation-duration: 30s;
    animation-delay: -5s;
}

.orb-3 {
    width: 25vw;
    height: 25vw;
    background: #e74c3c;
    top: 40%;
    left: 40%;
    animation-duration: 20s;
    animation-delay: -10s;
    opacity: 0.2;
}

.day-mode .orb-1 { background: #ffb74d; opacity: 0.7; filter: blur(60px); }
.day-mode .orb-2 { background: #4dd0e1; opacity: 0.7; filter: blur(60px); }
.day-mode .orb-3 { background: #f06292; opacity: 0.6; filter: blur(60px); }

@keyframes floatOrb {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(10vw, 10vh) scale(1.1); }
    66% { transform: translate(-5vw, 15vh) scale(0.9); }
    100% { transform: translate(0, -10vh) scale(1.05); }
}

/* 流星效果 */
.shooting-stars {
    position: absolute;
    width: 100vw;
    height: 100vh;
    top: 0;
    left: 0;
    z-index: 2;
    pointer-events: none;
}

.day-mode .shooting-stars {
    display: none;
}

.shooting-star {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 2px;
    background: transparent;
}

.shooting-star::before {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 150px;
    height: 1px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.8), transparent);
    animation: shooting 4s linear infinite;
    opacity: 0;
}

.shooting-star:nth-child(1) { top: 10%; left: 80%; transform: rotate(-45deg); }
.shooting-star:nth-child(2) { top: 20%; left: 70%; transform: rotate(-35deg); animation-delay: 2s; }
.shooting-star:nth-child(3) { top: 5%; left: 50%; transform: rotate(-45deg); animation-delay: 1.5s; }

.shooting-star:nth-child(1)::before { animation-delay: 0s; animation-duration: 3s; }
.shooting-star:nth-child(2)::before { animation-delay: 2s; animation-duration: 4s; }
.shooting-star:nth-child(3)::before { animation-delay: 1.5s; animation-duration: 3.5s; }

@keyframes shooting {
    0% { transform: translateX(0) scaleX(0); opacity: 0; }
    10% { opacity: 1; }
    50% { transform: translateX(-500px) scaleX(1); opacity: 0; }
    100% { transform: translateX(-1000px) scaleX(0); opacity: 0; }
}

/* 阳光光晕效果 (白天模式) */
.sunlight {
    position: absolute;
    top: -20vh;
    left: -20vw;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0.4) 30%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    pointer-events: none;
    z-index: 1;
    transition: opacity 1s ease;
    animation: sunPulse 8s infinite alternate ease-in-out;
}

.day-mode .sunlight {
    opacity: 1;
}

@keyframes sunPulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.1); opacity: 1; }
}

/* 白天模式漂浮粒子 */
.day-mode .stars {
    box-shadow: 
        10vw 20vh rgba(255,255,255,0.5),
        30vw 50vh rgba(255,255,255,0.4),
        70vw 30vh rgba(255,255,255,0.6),
        80vw 80vh rgba(255,255,255,0.5),
        20vw 80vh rgba(255,255,255,0.4),
        60vw 10vh rgba(255,255,255,0.5),
        90vw 60vh rgba(255,255,255,0.6),
        40vw 90vh rgba(255,255,255,0.4);
    animation: driftParticles 20s infinite linear;
    width: 4px;
    height: 4px;
    border-radius: 50%;
}

.day-mode .stars::after {
    box-shadow: inherit;
    top: 100vh;
}

@keyframes driftParticles {
    from { transform: translateY(0) rotate(0deg); }
    to { transform: translateY(-100vh) rotate(360deg); }
}

/* 顶部按钮 */
#theme-toggle {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-color);
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1.2rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    z-index: 10;
}
#theme-toggle:hover {
    background: var(--card-hover);
    transform: scale(1.05);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    text-align: center;
    margin-bottom: 40px;
    animation: fadeInDown 1s ease;
}

h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 5px;
    margin-bottom: 10px;
    text-shadow: var(--glow);
}

.subtitle {
    font-size: 1rem;
    opacity: 0.8;
    letter-spacing: 2px;
}

/* 搜索区域 */
.search-section {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 25px;
    gap: 15px;
}

#search-input {
    padding: 12px 20px;
    font-size: 1.2rem;
    border: 1px solid var(--card-border);
    border-radius: 25px;
    background: var(--card-bg);
    color: var(--text-color);
    width: 200px;
    text-align: center;
    backdrop-filter: blur(10px);
    outline: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

#search-input:focus {
    border-color: var(--primary);
    box-shadow: var(--glow);
}

#search-btn {
    padding: 12px 30px;
}

.search-result-area {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
    display: none; /* hidden by default */
    gap: 25px;
    align-items: center; /* 居中对齐 */
    box-shadow: var(--shadow);
    position: relative;
    width: 100%;
}

.search-result-area.active {
    display: flex;
    animation: fadeInDown 0.5s ease;
}

.search-result-card {
    flex-shrink: 0;
    width: 120px;
    height: 120px;
    font-size: 4rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.search-result-card:hover {
    background: var(--card-hover);
    transform: scale(1.05);
    box-shadow: var(--glow);
    color: var(--primary);
}

.search-result-card.selected {
    background: var(--card-hover);
    transform: scale(1.05);
    box-shadow: var(--glow);
    color: var(--primary);
    border-color: var(--primary);
}

.search-result-details {
    flex-grow: 1;
    color: var(--text-color);
    line-height: 1.6;
    font-size: 1.05rem;
    max-height: 250px;
    overflow-y: auto;
    text-align: left;
}

.search-close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.8rem;
    cursor: pointer;
    opacity: 0.6;
    transition: all 0.3s ease;
}

.search-close-btn:hover {
    opacity: 1;
    color: var(--danger);
    transform: scale(1.1);
}

/* 九宫格 */
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
    perspective: 1000px;
}

.char-card {
    width: 100px;
    height: 100px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
    cursor: pointer;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    transform-style: preserve-3d;
    animation: gentleShake 3s infinite ease-in-out;
}

/* 为每个卡片添加不同的延迟和持续时间，让晃动看起来更自然、随机 */
.char-card:nth-child(1) { animation-delay: 0.1s; animation-duration: 3.1s; }
.char-card:nth-child(2) { animation-delay: 0.5s; animation-duration: 2.8s; }
.char-card:nth-child(3) { animation-delay: 0.2s; animation-duration: 3.3s; }
.char-card:nth-child(4) { animation-delay: 0.7s; animation-duration: 2.9s; }
.char-card:nth-child(5) { animation-delay: 0.3s; animation-duration: 3.2s; }
.char-card:nth-child(6) { animation-delay: 0.8s; animation-duration: 3.0s; }
.char-card:nth-child(7) { animation-delay: 0.4s; animation-duration: 3.4s; }
.char-card:nth-child(8) { animation-delay: 0.9s; animation-duration: 2.7s; }
.char-card:nth-child(9) { animation-delay: 0.6s; animation-duration: 3.5s; }

@keyframes gentleShake {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 1px) rotate(-1deg); }
    75% { transform: translate(1px, 1px) rotate(0.5deg); }
}

.char-card:hover {
    background: var(--card-hover);
    transform: scale(1.1) translateZ(20px) !important;
    animation: none;
    box-shadow: var(--glow);
    color: var(--primary);
}

.char-card:active {
    transform: scale(0.95) !important;
}

.char-card.selected {
    background: var(--card-hover);
    transform: scale(1.05) translateZ(10px);
    animation: none;
    box-shadow: var(--glow);
    color: var(--primary);
    border-color: var(--primary);
}

.actions {
    text-align: center;
    margin-bottom: 50px;
}

.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1.2rem;
    border-radius: 25px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
    transition: all 0.3s ease;
    letter-spacing: 2px;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.6);
}

/* 底部区域 */
.selected-section {
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 25px;
    backdrop-filter: blur(10px);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 10px;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 400;
}

.secondary-btn {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 6px 15px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background: var(--danger);
    color: white;
}

.selected-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    min-height: 50px;
}

.selected-char {
    font-size: 1.5rem;
    width: 50px;
    height: 50px;
    background: var(--card-border);
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.5s ease;
}

/* 提示浮窗 */
.tooltip {
    position: fixed;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 15px;
    border-radius: 10px;
    max-width: 250px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(5px);
    transform: translate(-50%, -100%);
    margin-top: -15px;
}

.day-mode .tooltip {
    background: rgba(255, 255, 255, 0.95);
    color: #333;
    border: 1px solid rgba(0,0,0,0.1);
}

.tooltip.show {
    opacity: 1;
}

.tooltip-title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--primary);
    border-bottom: 1px solid rgba(255,255,255,0.2);
    padding-bottom: 5px;
}

.day-mode .tooltip-title {
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.tooltip-content {
    font-size: 0.9rem;
    line-height: 1.5;
}

.tooltip-empty {
    font-style: italic;
    opacity: 0.6;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* 自定义确认弹窗 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 30px;
    width: 90%;
    max-width: 350px;
    box-shadow: var(--shadow);
    text-align: center;
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.hidden .modal-content {
    transform: scale(0.8);
}

.modal-title {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 500;
}

.modal-text {
    font-size: 1.1rem;
    margin-bottom: 25px;
    opacity: 0.8;
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.modal-btn {
    padding: 10px 25px;
    border-radius: 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    letter-spacing: 1px;
}

.cancel-btn {
    background: transparent;
    color: var(--text-color);
    border-color: var(--card-border);
}

.cancel-btn:hover {
    background: var(--card-hover);
}

.confirm-btn {
    background: var(--danger);
    color: white;
}

.confirm-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(226, 74, 74, 0.4);
}

/* 响应式调整 */
@media (max-width: 600px) {
    .search-result-area {
        flex-direction: column;
        align-items: center;
    }
    .search-result-details {
        text-align: center;
    }
}